CVE-2020-15509

Name: CVE-2020-15509
Creator: NVD / NIST
Published: 2020-07-07T14:15:11.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2020-15509 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Nordic Semiconductor Android BLE Library through 2.2.1 and DFU Library through 1.10.4 for Android (as used by nRF Connect and other applications) can engage in unencrypted communication while showing the user that the communication is purportedly encrypted. The problem is in bond creation (e.g., internalCreateBond in BleManagerHandler).. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

Nordic Semiconductor Android BLE Library through 2.2.1 and DFU Library through 1.10.4 for Android (as used by nRF Connect and other applications) can engage in unencrypted communication while showing the user that the communication is purportedly encrypted. The problem is in bond creation (e.g., internalCreateBond in BleManagerHandler).

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.54%

41.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-319

Affected Software

Vendor	Product	Versions
Nordicsemi	Android Ble Library	<= 2.2.1
Nordicsemi	Dfu Library	<= 1.10.4

References

https://github.com/NordicSemiconductor/Android-BLE-Library/commits/masterPatch, Third Party Advisory
https://github.com/NordicSemiconductor/Android-DFU-Library/commits/releasePatch, Third Party Advisory
https://secretdiary.ninja/index.php/2020/07/03/norec-attack-stripping-ble-encryption-from-nordicsemis-android-library-cve-2020-15509/Patch, Third Party Advisory
https://github.com/NordicSemiconductor/Android-BLE-Library/commits/masterPatch, Third Party Advisory
https://github.com/NordicSemiconductor/Android-DFU-Library/commits/releasePatch, Third Party Advisory
https://secretdiary.ninja/index.php/2020/07/03/norec-attack-stripping-ble-encryption-from-nordicsemis-android-library-cve-2020-15509/Patch, Third Party Advisory

Timeline

Published: Jul 7, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15509?

How severe is CVE-2020-15509?

CVE-2020-15509 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15509?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15509?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST